diff --git a/debian/helper-script/pipal b/debian/helper-script/pipal
index 968c556..c70ff7d 100755
--- a/debian/helper-script/pipal
+++ b/debian/helper-script/pipal
@@ -1,3 +1,5 @@
-#!/bin/bash
+#!/usr/bin/env sh
 
-/usr/share/pipal/pipal.rb "$@"
+set -e
+
+exec /usr/share/pipal/pipal.rb "$@"